本文關鍵詞： 氣浮 氣泡 聚并 速度梯度 相群平衡模型 數(shù)值模擬 計算流體力學　出處：《化工學報》2016年06期 　論文類型：期刊論文

【摘要】：在氣浮接觸區(qū)內(nèi),聚并會導致氣泡直徑增大,對分離效果產(chǎn)生影響。采用相群平衡模型對接觸區(qū)氣泡聚并行為進行數(shù)值模擬,研究了氣泡聚并發(fā)生的原因及來液流量、回流流量對氣泡聚并的影響。首先分別應用Schiller-Naumann、Grace和Tomiyama 3種曳力系數(shù)模型進行模擬,所得氣泡直徑均與實驗值吻合,無明顯差異,選定Schiller-Naumann曳力系數(shù)模型對氣浮中兩相流動進行模擬。通過對模擬結果進行分析,表明回流入口周圍上下行流過渡區(qū)域存在較大速度梯度,是導致氣泡聚并的關鍵因素。最后研究了來液流量和回流流量對接觸區(qū)氣泡尺寸的影響,接觸區(qū)上部氣泡直徑隨回流流量增大而明顯增大,原因在于增大回流流量使得過渡區(qū)域速度梯度升高,氣泡聚并頻率提高;而來液流量對氣泡尺寸基本無影響。
[Abstract]:In the floatation contact zone, coalescence will lead to bubble diameter increases, impact on the separation effect. The population balance model of the contact zone bubble coalescence was simulated, the reason of bubble coalescence occurs and fluid flow, back flow effect on bubble coalescence. Firstly, using Schiller-Naumann, Grace Tomiyama and 3 kinds of drag coefficient model was simulated, the bubble diameter are in agreement with experiment, no significant difference, Schiller-Naumann model of the air drag coefficient is selected in two-phase flow simulation. By analyzing the simulation result showed that the return on the downstream transition region around the entrance there is a big velocity gradient is the key factor leading to the bubble coalescence the final study. To influence the fluid flow and reflux flow on the contact zone of bubble size, bubble diameter upper contact zone with reflux flow increases clearly increased The reason is that the increasing flow rate increases the velocity gradient in the transition region, and the bubbles gather and increase the frequency, but the flow rate has no effect on the size of the bubble.

【作者單位】： 中國石油大學(華東)重質(zhì)油國家重點實驗室;
【基金】：中央高�；究蒲袠I(yè)務費專項資金項目(14CX06097A)~~
【分類號】：O35

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本文編號：1533849